10 Calcium Element Facts You Should Know

Calcium is one of the elements you need in order to live, so its worth knowing a little bit about it. Here are some quick facts about the element calcium. Fast Facts: Calcium Element Name: CalciumElement Symbol: CaAtomic Number: 20Standard Atomic Weight: 40.078Discovered By: Sir Humphry DavyClassification: Alkaline Earth MetalState of Matter: Solid Metal Calcium is element atomic number 20 on the periodic table, which means each atom of calcium has 20 protons. It has the periodic table symbol Ca and an atomic weight of 40.078. Calcium isnt found free in nature, but it can be purified into a soft silvery-white alkaline earth metal. Because the alkaline earth metals are reactive, pure calcium typically appears dull white or gray from the oxidation layer that quickly forms on the metal when its exposed to air or water.  The pure metal can be cut using a steel knife.Calcium is the 5th most abundant element in the Earths crust, present at a level of about 3% in the oceans and soil. The only metals more abundant in the crust are iron and aluminum. Calcium is also abundant on the Moon. It is present at about 70 parts per million by weight in the solar system.  Natural calcium is a mixture of six isotopes, with the most abundant (97%) being calcium-40.The element is essential for animal and plant nutrition. Calcium participates in many b iochemical reactions, including building skeletal systems, cell signaling, and moderating muscle action.  It is the most abundant metal in the human body, found mainly in bones and teeth. If you could extract all of the calcium from the average adult person, youd have about 2 pounds (1 kilogram) of the metal.  Calcium in the form of calcium carbonate is used by snails and shellfish to construct shells.Dairy products and grains are the primary sources of dietary calcium, accounting or about three-quarters of dietary intake. Other sources of calcium include protein-rich foods, vegetables, and fruits.Vitamin D is essential for calcium absorption by the human body. Vitamin D is converted to a hormone which causes intestinal proteins responsible for calcium absorption to be produced.Calcium supplementation is controversial. While calcium and its compounds are not considered to be toxic, ingesting too many calcium carbonate dietary supplements or antacids can cause milk-alkali syndrom e, which is associated with hypercalcemia sometimes leading to fatal renal failure. Excessive consumption would be on the order of 10 g calcium carbonate/day, though symptoms have been reported upon ingesting as little as 2.5 g calcium carbonate daily.  Excessive calcium consumption has been linked to kidney stone formation and artery calcification.Calcium is used for making cement, making cheese, removing nonmetallic impurities from alloys, and as a reduction agent in the preparation of other metals.  The Romans used to heat limestone, which is calcium carbonate, to make calcium oxide. The calcium oxide was mixed with water to make cement, which was mixed with stones to build aqueducts, amphitheaters, and other structures that survive to the present day.Pure calcium metal reacts vigorously and sometimes violently with water and acids.  The reaction is exothermic. Touching calcium metal can cause irritation or even chemical burns. Swallowing calcium metal can be fatal.The elem ent name calcium comes from the Latin word calcis or calx  meaning lime.  In addition to occurrence in lime (calcium carbonate), calcium is found in the minerals gypsum (calcium sulfate) and fluorite (calcium fluoride).Calcium has been known since the 1st century, when the ancient Romans were known to make lime from calcium oxide.  Natural calcium compounds are readily available in the form of calcium carbonate deposits, limestone, chalk, marble, dolomite, gypsum, fluorite, and apatite.Though calcium has been known for thousands of years, it was not purified as an element until 1808 by Sir Humphry Davy (England). Thus, Davy is considered to be the discoverer of calcium. Sources Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 112.Parish, R. V. (1977).  The Metallic Elements. London: Longman. p.  34.Weast, Robert (1984).  CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp.  E110.​

A Career As A Career Of A Policy Officer - 1497 Words

I wish to be considered for the role of a ‘Policy Officer’ as I strongly believe my seven years of experience working as research projects officer in CSIRO (Plant and Food Sciences group) will be very suitable to carry out the responsibilities of this position towards bringing the best outcomes. My knowledge is underpinned by significant academic achievements, including a PhD in Agricultural Science, a Master of Applied Science in Biotechnology and a Bachelor of Science in Biochemistry. Being involved in different agricultural projects at CSIRO, my work contributes to enhance productivity, profitability and sustainability in Australia’s agricultural industries. I undertake research, experimental work and analysis on crop improvement,†¦show more content†¦My recommendation based on through analysis supported the collaborators in making decisions on selecting wheat lines for testing in field trials in different rain fall zones of Australia. Following up on our meeting, I arranged quarantine approvals by communicating appropriate Government Authority, and distributed them among the collaborators. My highly developed research and analytical skills, and communication with the collaborators enhanced team productivity in many ways and that has been highly valued in our annual collaborator project meeting. My experience explained above is based on only one project out of several that I have been actively involved in over the last seven years. For the successful completion of each project, I identify the issue and my scopes in the project, research relevant background and context, identify possible alternatives, carry out required consultations, select the best possible methodologies and finally contribute in preparing written project reports and scientific publications. My experiences together with my academic background demonstrate my strong suitability for the position of a ‘Policy Officer’. I welcome the opportunity to attend an interview to further elaborate on my ability for this position. I wish to be considered for the role of a ‘Policy Officer’ as I strongly believe my seven years of experience working asShow MoreRelatedForeign Service Officer For Citizenship And Immigration Canada878 Words   |  4 PagesFor as long as I can remember, I have always wanted a career that would continually broaden my horizons and benefit society at large. I am interested in a career as a Foreign Service Officer for Citizenship and Immigration Canada (CIC) because of the international scope and dynamism of its long-term career path as well as the opportunity to contribute to Canadian society as a member of the public service. Although these aspects of the career appeal to me, I also recognize them as the two most challengingRead MoreCareer Paths That I Have Interest Essay1145 Words   |  5 Pagesexplore two career paths that I have interest in. 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Routine novels Essay Example For Students

Routine novels Essay 1. In the beginning of the book, the first difference that can be observed is the cultural crash between the families that adopted the Korean girls. The contrast between the families was clear.The Donaldsons arrived with balloons and cameras, a huge amount of people, they were totally Americans, had all the costumes(food, culture way of living) and traditions from the United States. The Yazdans family, on the other hand, were not noticed, they were waiting quietly with few people the baby arrival. They were different, they followed their habits and costumes with strictness. What would probably happen is a cultural shock between both families, because each country, has its own religion, habits, and for persons to live in a convivid atmosphere, everyone must respect its choices†¦ The families will probably suffer different types of daily situations when they start educating their children. The Donaldsons kid might be a typical American girl, with all the thoughts, desires that an girl who lives in America has. The Yazdans family will have a way of educating their kid in their culture patterns, fact that may cause some problems for them in the future, because its very hard to maintain a tradition of a home country living in another, who will probably suffer the most is Susan, not finding her identity in this situation. 2) Dave Dickinson was a recent widowed man, his wife Connie died with cancer3. The significant event that happened was when he began dating Maryam Yazdam. He was feeling awful after his wife death, he couldnt think of anyone else. But then, he started feeling lonely in his big house and began finding excuses to be near to Maryam, an Iranian woman, very in touch with her culture. She had difficulties to attach to people, she had her own independent life. But they became very close, he was impressed by her, he wanted to know more about her costumes, he wanted to be with her, sometimes he caught himself thinking of her in a different way. After a while, he realized was in love with her, and then, they began a relationship with the culture conflict, but love won after all 3) The book shows how the United States became a melting pot, with different people of distinct countries in the same environment. At the same time, it relates how dificult is to understand other peoples costumes , it shows that everybody must respect and learn how to deal with the others .  Of course its hard for people who learnt things in a way, see others acting on the exact diferent way, it ´s hard to accept in the beginng, but with pacience and open mind, convive with other cultures is a way to expand knowledge and life experiences, exchanging informantions, daily costumes and life stories I can totally understand the situation, in the deep inside we are all the same, and we must respect each other no matter what choices of culture we have.  4)The author was successful. Anne Tyler is known around the globe for writing daily routine novels, what is amazing about that, is that even when she writes about normal things, her books still interesting and very unique. They have deep descriptions of the characters, it is shaprly observed , fact that makes the reader enter deeply in the story, materializing the characteristics and personalities of each characters in the novel. She brought on her novel a very controversial theme, in which any persons has lots of diferente thoughts and disagreements, what makes the book very discussable. Despite the fact that reading this piece is incredible, we cant see time passing during it.  Since the beginning of the story, we can see the differences between the cultures. The kids arrival celebrating party for example showed the differences of food and people, because there was a mix of cultures such as Korean, american and iranian.

Student Uniforms Essays - Uniforms, Childrens Clothing,

Student Uniforms Student Uniforms Students are always complaining about the dress codes at their school, and totally rejecting the idea of school uniforms, but I feel there are many benefits to this proposal. These days everyone is so concerned about being attractive and popular that they forget the real reason for going to school. The increase in academic performance and school spirit, along with the decrease in violence, is more important than looking cool for your friends. South Carolina school systems have the lowest test scores in the nation. Our students are not daft; they just do not consider schoolwork a top priority. With uniforms for every student, there would be less focus on fashion and more emphasis on education. Our report cards would be posted on the refrigerators for everyone to see, rather than stuffing them in the bottom of our backpacks. The students would be rewarded for their efforts, therefore their self esteem would also rise. Teen violence has reached its peak in our schools. Last year, numerous killings took place at schools around the country, largely due to taunting amongst the students. Uniforms would prohibit the wearing of chains, large pockets for hiding weapons, and gang colors worn to incite fights. Less students would be teased for their attire, and sexual harassment caused by provocative clothing would come to an end. Our schools would provide a more secure environment in which we all could learn. School spirit in South Carolina is extremely lacking, and it shows. Our athletic teams have very limited support, and it affects their performance greatly. A student could be missing on a field trip, and they would not be located for hours because they simply "blended" with the crowds from other schools. If we were obligated to wear uniforms, we would be more recognizable in public surroundings, and our sense of school pride would blossom. To quote Henry David Thoreau, "take the earth at your feet, and paint your house that color." School spirit should shine eminently in all students' lives; not fizzle out like a dampened fuse. Many students argue about the restrictions on their personal freedom. They do not realize that they could still select their own trendy accessories, and they can wear whatever they desire at home and on the weekends. I feel also, that with a standardized dress code, individual personalities would shine, and not be hidden behind the latest fashion. Parents are constantly advising their children that if everyone appeared the same on the outside, people would begin to recognize others for what is on the inside. We are encouraged to change the standards and be individuals. We should all stand out in what we achieve, and what we believe; not in what we wear.